Expansion valve



Patented Mar. 13,1928.

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PATENT oF-Flcs. A

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nxrANsroN VALVE.

` Applicationled June' 28,

struction, combinations and arrangements l of parts as will be more fully described and f particularly pointed out in the claims. '1.

In the accompanying drawing; y Figure 1 is a Yvertical sectional View through a thermostat embodying my invention. Figure 2 is a cross sectional view taken onthe line 2-2 of Figure 1. Y

Figure 3 isa fragmentary vertical sectional -view through a modified construction.

Referring now to the drawing, the numerals 1 'and 2 respectively designate upper `and lower cooperatmg sections of a valve casing, 3 is a plunger valve, 4 is' a diaphragm for actuating -said valve, and 5 is a coil spring for actuating the diaphragm. As shown, the diaphragm, valve, spring, and lower section 2 ofthe casing are identical in construction to that shown in the Fred J. Heideman application led Sept. 21, 1925, and

appended bearing Serial No. 57,789, while the superL structure suchas the upper section 1, expansible chamber 6, follower 7 and cover 8 comprise the essence of my invention. As shown, the upper section 1 `of the casing is detachably secured-to the lower section 2 in `a manner similar to the connection between the parts 10 and 11 respectively of the Heideman construction, but is preferably cupshape in form and is normally closed by the inverted cup-shaped cover 8. Both the section 1 and the cover 8 are metal castings having relatively thick walls, hence these parts will serve effectively asv holdovers, for instance when the doors 4of the refrigerating cabinet are opened incident tothe insertion or removal of foods, etc. The expansible chamber 6 is preferably located in the cupshaped section 1 and preferably comprises the vertically spaced heads 9 and 10 and the intermediate bellows 11. To provide an eicient construction, the ends of the bellows 11 are sealed to the heads 9 and 10 lrespectivel while the latter are preferably provide with aligned projections 12 and 13 respectively. AS shown, the upstanding pro- Yjection .12 is conical in form and engages similarly shaped recess 14 inthe cover 8,

'1926. serial No. 119,152.

while the depending projection 13 is prcf- 55 erably cylindrical in form andv slidably cngages a similarshaped opening 15 in thej base 16 of. the upper section'. Preferably this cylindrical projection 13 and the head 10 have registering bores 17 and 18 through which a suitable fluid such as CH3CL may be introduced to charge the bellows 11.' Any suitable means' such as the plug 19 may' be used to close the bore 17 after the bellows have been charged. Preferably the projection 13 is provided at its lower end with a y recess 20 that receives the upper end of the spring 5, hence this/pro ection 13 will serve as a follower between c spring 5 and expansible chamber 6. g I0 In use, the movement ofthe diaphragm 4 Tand valve 3 will be controlled automatically by ythe expansible chamber 6 according to temperature changes in the refrigerator cabinet. In Figure 3 I'have shown a slight modification in which an elliptical bellows orexpansible chamber 30 has been substituted for the expansible chamber 6. As shown, this chamber 30 is adapted to be charged with a suitable fluidA such as. CH3CL thru a bore 31 ina depending stem 32. ,With

this construction, the follower 33 is'. formed separate from the bellows30 but is slidably mounted similar to the follower 13 in the opening 15.

Thus, from the foregoing description, it will be apparent that I have provided an expansionvalvewith a thermocontrol that is simple and 'compact in construction, and that can be manufactured and readily installed at a comparatively low cost. Inasmuch as the expansible chamber'is enclosed by the section 1 and cover 8 which serve as' holdovers, it will also be apparent that the expansible chamber 6' will oper-te with the maximum efficiency Ato regulate automatically the movement ofthe `diaphraefm and valve. Moreover the arrangement 'be tween the cover, expansible chamber and t uppermost section 1 is such that the cover 8 may be readily adjusted on the section 1 to .regulate the movement of the expansible chamber 6 in an upward direction.

.While it is believed that from the foregoing description, the nature and advantage? of'my invention will be readily apparent, I Q desire to have vit understood that I do not limit myself to what is herein shown and described and that such changes may be resorted to when desired as fall within the scope of what is claimed.

What I claim as my invention is:

l. In an expansible valve, the combination with a sectional valve easing, a valve in the casing, ay diaphragm for actuating the valve, and a yieldable element for actuating the diaphragm, of means for regulatingr the movements of lsaid valve including a follower for the vieldablc element slidably mounted in one section of the casing, an expansible chamber in said section, and a cover for said section adjustable to regulate the inovenient of said expansible chamber in one direction.

2. In an expansible valve, the combination with a sectional valve casing, a valve in the casing, a diaphragm for actuating the valve, and a vieldable element for actuating the diaphragm, of a cover for the uppermost section of said casing, and an expansible chamber located in the uppermost section and havingr substantially aligned projections engaging respectively Isaid cover and yieldablc element.

Il. In an expansion valve, the. combination with a valve and a casing therefor, of an expansion chamber operatively connected to said valve, and means for regulating movement of said expansion chamber including an adjustable cover for said casing, abuttingly engaged with said expansion chamber.

4. In a mechanism of the character described, a holdover casing having an adjustable abutment, an expansion chamber having an end Wall engaged by said abutment, said expansion chamber having a second end wall movable with respect to the lirst-named end wall, and a valve controlling a fluid passageway located exterior-ly of the holdover casing having an operative connection with said secondaiamed end wall.

In Ia mechanism of the character described, a holdover casing having an adjustable cover, a bellows enclosed within the casing and having end walls. one of which is engaged b v said adjustable cover, and a valve controlling a fluid passageway located cxteriorly ol thc holdover casin r havin; r an operative connection with the otlier end wall of the bellows.

6; In an expansion valve, the conibination with a casing. an expansible chamber located in the casing and having end walls, a valve operatively connected to onel of said end walls. of an adjustable cover for said casing abutting with the other end wall and forming a means for regulating movement of said expansible chamber.

In testimony whereof I affix my signature.

THOMAS o. WHITEI-IEAD. 

